David Sparks is as productive as always. Next to going solo as a lawyer he just released his latest MacSparky Video Field Guide. This time you can learn the extremely powerful iOS automation app Workflow in his well produced tutorial.
If Evernote is your main information hub then Jefferson Stovall's post and screencast about using it as a GTD® system will be of interest.
Jefferson also provides two good reasons why Evernote is a good application to manage your actions and projects:
Getting information into Evernote is easy, fast and almost universal.
Evernote is fully available on almost any device. During the course of the day, I probably work on two different MacBooks, one iMac, one iPad and one iPhone. Ninety-nine percent of the time, Evernote is updated and available wherever I sit down to use it.
The implementation is in some parts simplified, but still solid and most importantly: practical. Actions and projects are notes which get filled into notebooks representing Areas of Responsibility — although Jefferson went for the least granular level here — and Contexts are implemented using tags.
Adding to Jefferson's reasons on "why Evernote" I would highlight that Evernote's search capabilities are amongst the most versatile. The setup introduced also relies on saved search strings to make GTD work in Evernote.
This screencast provides a nice overview of Jefferson's Evernote GTD setup.
You should really use Evernote more and read Evernote Essentials to master the tool. It will help tremendously getting more out of the application like implementing a similar setup.